# Polars again

## Homework Statement

A.Using polar coordinates, evaluate the improper integral of e^(-10(x^2+y^2))dxdy
B. use part A to integrate from negative infinity to positive infinity of e^(-10x^2)dx

2. Homework Equations [/b]

## The Attempt at a Solution

i got part A to be pi/10, but for part B i clueless, can someone please give me a hit on how to integrate it!